// [The "BSD licence"]
// Copyright (c) 2007 Kay Roepke
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// 1. Redistributions of source code must retain the above copyright
//    notice, this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright
//    notice, this list of conditions and the following disclaimer in the
//    documentation and/or other materials provided with the distribution.
// 3. The name of the author may not be used to endorse or promote products
//    derived from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
// IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
// OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
// IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
// NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
// THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#import <Cocoa/Cocoa.h>

@interface ANTLRBaseRecognizerState : NSObject {
	NSMutableArray *following;			// a stack of FOLLOW bitsets used for context sensitive prediction and recovery
	NSMutableArray *ruleMemo;			// store previous results of matching rules so we don't have to do it again. Hook in incremental stuff here, too.
	BOOL errorRecovery;					// are we recovering?
	BOOL failed;						// indicate that some match failed
	int backtracking;					// the level of backtracking
	int lastErrorIndex;
}

- (void) reset;

- (NSMutableArray *) following;
- (NSMutableArray *) ruleMemo;

- (BOOL) isErrorRecovery;
- (void) setIsErrorRecovery: (BOOL) flag;

- (BOOL) isFailed;
- (void) setIsFailed: (BOOL) flag;

- (int) backtracking;
- (void) setBacktracking:(int) value;
- (void) increaseBacktracking;
- (void) decreaseBacktracking;
- (BOOL) isBacktracking;

- (int) lastErrorIndex;
- (void) setLastErrorIndex:(int) value;

@end
